inadequacy in WordNet English dictionary

1. lack of an adequate quantity or number
   "the inadequacy of unemployment benefits"
   insufficiency  inadequacy  deficiency 
   
2. unsatisfactoriness by virtue of being inadequate
   inadequacy  inadequateness 
   
3. a lack of competence
   "pointed out the insufficiencies in my report"; "juvenile offenses often reflect an inadequacy in the parents"
   insufficiency  inadequacy